53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
#include<iostream>
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#include<cstdio>
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using namespace std;
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int vis[40100];
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int q[12000];
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int main()
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{memset(vis,1,sizeof(vis));
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vis[1]=0;
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int t=0;
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for(int i=2;i<=40000;i++)
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{if(vis[i])
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{for(int j=i;j<=40000;j+=i)
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vis[j]=0;
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q[++t]=i;
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}
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}
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long long int shu[100],ge[100];
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long long int n;
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while(cin>>n)
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{if(n==1){cout<<"0"<<endl; continue;}
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if(n==4){cout<<3<<endl; continue;}
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long long int m=1,k=0;
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long long int tt=n;
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memset(shu,0,sizeof(shu));
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memset(ge,0,sizeof(ge));
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while(tt>1&&m<t)
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{if(tt%q[m]==0)
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shu[++k]=q[m];
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if(k>=3)break;
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while(tt%q[m]==0)
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{tt/=q[m];
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ge[k]++;
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}
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m++;
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}
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if(tt>1)
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{shu[++k]=tt;
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ge[k]++;
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}
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if(k>=3) {cout<<1<<endl; continue;}
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if(k==1)
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{if(shu[1]!=2)
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cout<<(n-1)<<endl;
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else cout<<1<<endl;
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}
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if(k==2)
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{if(shu[1]==2 && ge[1]==1)
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cout<<n-1<<endl;
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else cout<<1<<endl;
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}
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}
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}
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